<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>变量和数据类型</title>
</head>
<body>
    
     <script>
         // 声明变量并且使用
    //   var number1 = 10;
    //   document.write("number1的数据类型是：" + typeof number1);


    //   var result = 5>3;
    //   document.write(" </br>result的数据类型是：" + result);

    //   document.write(" </br>result的数据类型是：" + typeof result);
    //   var str = "hello"
    //  document.write(" </br>str的数据类型是：" + typeof str);
     
     var number1 =9;
     var number2 =4;
     document.write("number1:" + number+";number2:"+number2);
     document.write( "</br> number1/number2 = " + (number1/number2));


     </script>
   
    
</body>
</html>